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Chapter 5.2 Genetics Since Mendel PowerPoint PPT Presentation


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Chapter 5.2 Genetics Since Mendel. When offspring of 2 homozygous plants show an intermediate phenotype examples: 1)red flower mated with a white flower and produces a pink flower 2) sickle cell. 1. Incomplete dominance. 2. Multiple alleles.

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Chapter 5.2 Genetics Since Mendel

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Chapter 5 2 genetics since mendel

Chapter 5.2

Genetics Since Mendel


Chapter 5 2 genetics since mendel

  • When offspring of 2 homozygous plants show an intermediate phenotype

  • examples:

  • 1)red flower mated with a white

  • flower and produces a pink

  • flower

  • 2) sickle cell

1. Incomplete dominance


Chapter 5 2 genetics since mendel

2. Multiple alleles

  • A trait controlled by more than 2 alleles

  • traits controlled by multiple alleles will produce more than 3 phenotypes

  • Examples: blood type

    • 3 possible blood types A, B, and O

    • O is recessive to A and B

    • if you have both an A and B you show expressions of each allele called AB

    • if you have “A” type you are either AA or AO(same for B, it’s BB or BO)

    • If you have O blood you can only have OO


Chapter 5 2 genetics since mendel

  • Occurs when a group of gene pairs act together to produce a trait

  • example- shades of eye color, hair color, height, skin tone, etc.

3. Polygenic inheritance


Chapter 5 2 genetics since mendel

4. Environmental Impact

  • 2 types:

  • - internal- chemical dominance

  • - male birds brighter than

  • females

  • - external- environment change

  • - exposure to sun results in

  • skin cancer

  • - taking precautions vs. not

  • - smoking

  • - alcohol


Chapter 5 2 genetics since mendel

  • Both parents are heterozygous Xx but both “x” recessive allele holds a disorder.

  • the child inherits “xx” and has the disorder neither parent knew they carried

  • example: Cystic Fibrosis

5. Recessive Genetic Disorders


Chapter 5 2 genetics since mendel

6. Cystic Fibrosis

  • Recessive genetic disorder

  • common in Caucasian Americans

  • can lead to death

  • occurs when a thick fluid lines the lungs and intestinal tract making it hard to breathe

  • results in bacterial growth and respiratory infections


Chapter 5 2 genetics since mendel

7. sex-linked disorders

  • Occurs in meiosis (sex cell reproduction)

  • more common in males because males only have one x that needs to be recessive

  • example: 1. color blindness

    • On x allele

    • recessive disorder

    • 2. Calico cats

    • - On x chromosome


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